Process of dyeing leather.



Patented Oct. 31,1899.

' No. 636,l78.

a. mum. PROCESS OF DYEING LEATHER.

(Application filed Sept. 7, 1899.) (No Hod 2 Sheets-Sheet cams PETERS 0a.. mp'ru-umo" wnsumaruu D c No. 636',l78. Patented Oct. 3|, I899.

B. RIEDER.

PROCESS 0F DYEING LEATHER.

(Apphcatxon filed Sept 7, 1899) 2 Sheets-Sheet 2 000 0 0o 00 no 0 00000000 (No Model.)

PATENT RICHARD RIEDER, OF FREIBERG, GERMANY.

PROCESS OF DYEING LEATHER.

SPECIFICATION forming part of Letters Patent No. 636,178, dated October 31, 1899.

Application filed September '7, 1899- Serial No. 729,757. (No specimens.)

To all whom it may concern.-

Be it known that I, RICHARD RIEDER, manager, a subject of the Emperor of Austria- Hungary, and a resident of Stollengasse l, Freiberg, in the Kingdom of Saxony and Empire of Germany, have invented certain new and useful Improvements in Processes of Dyeing Skins or Leathers, of which the following is a full, clear, and exact description.

In order that my invention may be fully understood, I will proceed to describe it with reference to the accompanying drawings, in which- Figure I is a side view of one of the plates employed in my improved process. Fig. II is a side view of a hinged plate unfolded. Fig. III is a side view thereof folded. Fig. IV is an end view of the same folded. Fig. V is a vertical section on the line V V, Fig.

VI, of a vat employedin connection with my.

improved process. Fig. VI is a vertical section on the line VI VI, Fig. V, thereof.

a and b are plates on which the skins or leathers to be dyed .are stretched and fastened by means of adhesive cement. a are simple thin plates of zinc or other suitable material on which the skin or leather is fastened either in quite flat position or with one-half of each skin or leather upon each side of the plates. 1) are folding plates provided with hinges b, and which are used with advantage for larger skins or leathers, which are placed thereon and then folded.

c is a vat which serves to hold the dyestuff, water, and the plates, with the skins or leathers upon them, during the dyeing or Washing away of the superfluous dye.

In order to dye skins or leathers by my process, the skins or leathers in a damp state are stretched fiat and at the same time placed upon their plates in the way shown. The skins or leathers are coated upon the flesh side before they are placed on the plate with a suitable cement selected according to the character of the skins or leathers to be dyed and of the finishing or dressing thereof. For

instance, chrome skins or leathers, which are very elastic and therefore adhere with dlfficulty to the plates and also receive the dye with difficulty and on this account require greater heat and more active agitation of the plates, must be coated with a very strong cement, such as glue, dextrine, or the like. Ordinary and sumach tanned skins or leathers take the dye easily and require scarcely any agitation in the dye-vat and remain easily adherent, especially if they are treated with thin starch paste, Iceland moss, or linseed decoction, and the like materials are sufficient to fasten them on the plates. This treatment also serves at the same time as a dressing for the flesh side of the finished skins or leathers.

The skins or leathers fastened upon the plates are immersed by hand or by a suitable lever arrangement in greater or less number into a single vat or row of vats arranged so that the vats can be filled with dyestuff or emptied when desired. The leather, the dyestuff, or both simultaneously can be agitated by any suitable means.

In order to remove the superfluous dyestufl from the-skins or leathers dyed in the way described, vats such as those described above are filled with water and with the skins or leathers fastened on the plates, which are agitated in it and heated, as above described.

In order to remove the superfluous water from the skins or leathers, they are made to pass, together with all the plates, through suitably-arranged squeezing-rollers and then further treated in the usual way.

Works relating to the subject (see, for instance, WViener, Lederfctrbe'r'ei, 2d edition, 1896, Wien, Hartleben, page 135, Beller, Glaclederfarberei, 1880, Wiener, Voigt) mention a method of dyeing on plates which dif-.

fers very essentially, however, from that described above, as in the former the skins or leathers are stretched flat upon dyeing tables or plates and are then brushed over with the dyeing liquid, each skin or leather being in this way dyed separately, while by the new process above described a number of skins or leathers are stretched upon plates and are then all, together with the plates, immersed in the dye-bath and dyed.

Specification of German Patent No. 30,282, class 8, relates to stretching-frames for varnished and dyed skins, which are used for leather already varnished and dyed to prevent them from shrinking while drying.

Having thus described my invention, the

stuff and finally washing them, and removing and pressing them between rollers. 10

In witness whereof I subscribe my signature in presence of two Witnesses.

RICHARD RIEDER.

following is what I claim as new therein and desire to secure by Letters Patent:

A process for dyeing leather uniformly and only upon the grain side, consisting in firmly 5 fastening the flesh side of the skin by means of cement upon plates, suspending the plates Witnesses:

in a dye-vat, dyeing the skin by agitating the FREDRIO OURZEL, plates in the dye or by agitating the dye- HERNANDO DE SOTO. 

